Yes, I got this from Google yesterday, would be good to get some guidance from Shopify on how to fix this:
Missing delivery information in your merchant listings on your sites
Delivery information is an important factor when shoppers are considering whether to buy products from your website, which means that displaying this information clearly can help improve the success of your online sales. To help Google understand and display your delivery information in shopping results, add delivery structured data.
To help you monitor and fix issues, Search Console is now reporting issues in the Merchant listings report when delivery information is missing or added incorrectly.